GB 2635-1992 PDF English
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GB 2635-1992: Flue-cured tobacco---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB2635-1992
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC 663.973.051.7
B 35
Flue-Cured Tobacco
烤烟
[Including Amendments No.1 and No.2]
ISSUED ON: AUGUST 15, 1992
IMPLEMENTED ON: SEPTEMBER 01, 1992
Issued by: State Bureau of Technical Supervision
Table of Contents
1 Subject Contents and Applicable Scope ... 3
2 Normative References ... 3
3 Terms and Codes ... 3
4 Groups, Grading ... 7
5 Technical Requirements ... 7
6 Acceptance Rules ... 10
7 Inspection Methods ... 13
8 Inspection Rules ... 16
9 Physical Standard Sample ... 17
10 Packaging, Marking, Transportation, Storage ... 17
Additional Information: ... 19
QB/T 2635-1992 "Flue-Cured Tobacco" Amendment No.1 ... 20
QB/T 2635-1992 "Flue-Cured Tobacco" Amendment No.2 ... 21
Flue-Cured Tobacco
1 Subject Contents and Applicable Scope
This Standard specifies the technical requirements, inspection methods and
acceptance rules for flue-cured tobacco.
This Standard applies to bundled flue-cured tobacco that has not been fermented after
initial or re-baking. The written standards, supplemented by physical samples, are the
basis for grading, acquisition, and handover. Export supply is based on physical
samples.
2 Normative References
GB 8170 Rules for Rounding off of Numerical Values
3 Terms and Codes
3.1 Terms
3.1.1 Groups
It is formed by the classification of the closely related grades, on the basis of certain
features related to the location, color and overall quality of the tobacco leaf.
3.1.2 Grading
The grade of the tobacco leaves in the same group, which is classified according to
the quality.
3.1.3 maturity
The degree of maturity of tobacco leaves after modulation (including field and
modulation maturity), the maturity is divided into the following levels:
3.1.3.1 Mellow
The upper tobacco leaves that are reached a high degree of maturity in the field, and
they are fully ripe after modulation.
3.1.3.2 Ripe
color, which is divided into the following levels:
3.1.7.1 Deep
The leaf surface is uniform in color and saturated in color and luster.
3.1.7.2 Strong
The color is uniform, and the saturation is slightly worse.
3.1.7.3 Moderate
The color is uniform yet and the saturation is general.
3.1.7.4 Weak
The color is not uniform, and the saturation is poor.
3.1.7.5 Pale
The color is not uniform, and the luster is light.
3.1.8 Length
The distance from the end of the main veins of the leaf to the tip, which is expressed
in cm.
3.1.9 Waste
Tobacco leaf tissue is damaged, losing the strength and firmness of the strips, and
basically has no use value (including disease spots, scorched tips and scorched edges
due to the maturity increase of tobacco leaf), expressed by a percentage (%).
3.1.10 Injury
The leaf loses its original integrity due to mechanical damage, and the damaged area
of each leaf does not exceed 50%, expressed by a percentage.
3.1.11 Color
The state of the related color, luster saturation and color value of the same type of
tobacco leaves after modulation.
3.1.11.1 Lemon
Tobacco leaves are all yellow in appearance, within the color gamut used to be called
pale yellow and positive yellow.
3.1.11.2 Orange
5.5 The bundled requirements of tobacco leaves shall be natural bundle with 25~30
leaves per bundle; the bundle head circumference is 100~120mm and the winding
width is 50mm.
6 Acceptance Rules
6.1 Grading principles
When the maturity, leaf structure, body, oil, color intensity, and length of flue-cured
tobacco reach a certain grade, and the waste does not exceed the allowable degree
of a certain grade, it is determined as a certain grade.
6.2 Determination of the final grade
When the re-inspection does not match the determined grade, then the original grade
is invalid.
6.3 If a batch of tobacco leaves is on the boundary of the two colors, then the color will
be determined first and then determine the grade according to other qualities.
6.4 If a batch of tobacco leaves is at the boundary of two grades, then it shall be
determined at lower grade.
6.5 If the grade element of a batch of tobacco leaves is grade B, when one of which is
lower than grade B, then it shall be determined at grade C; when one or more elements
are higher than grade B; then it shall still be determined at grade B.
6.6 All the following phenomena shall not be graded, such as green tablets, frozen
tobacco leaves, fire damage, fire smoke, odor, mildew, doping, moisture overrun, etc.;
and shall not be acquired.
6.7 The cutters of lugs variegated grade 1 (CX1K) is limited to the waist leaf and the
lower second shed position.
6.8 Slick grade 1 (S1) is limited to the waist leaf, the upper and lower second shed
positions.
6.9 Green-yellow grade 1 is limited to tobacco leaves containing 20% or less of the
green.
6.10 Green-yellow grade 2 is limited to tobacco leaves containing 30% or less of the
green.
6.11 In Group H, H1F is orange; and H2F includes orange and red.
6.12 Tobacco leaves of which the cutters’ greenish quality is lower than C3V shall be
listed in the grade X2V.
6.13 If the cutters leaf is shorter than 35 cm, it shall be determined at the grade of lugs
leaf.
6.14 Tobacco leaves with a variegated area over 20% are graded in variegated group.
6.15 Tobacco leaves with a variegated area of less than 20% are allowed to be graded
in the positive group; but the sum of variegated and waste must not exceed the
percentage of waste at the corresponding grade. If the above sum exceeds the
percentage, it shall be determined at the next grade. If the sum of the variegated and
waste exceeds the minimum level of waste tolerance in this group, it may be
appropriately graded in the variegated group.
6.16 The CX1K variegated area does not exceed 30%; if exceeding, it shall be
determined at the next grade.
6.17 B1K variegated area does not exceed 30%.
6.18 B2K variegated area does not exceed 40%; if exceeded 40%, it shall be
determined at the next grade.
6.19 The faded tobacco is graded in the slick group.
6.20 Slightly flue-cured red tobacco with no obvious influence on the basic color shall
be graded in the corresponding position and color group at grade 2 below.
6.21 If there are both slick and variegated tobacco leaves on the leaf, it shall be graded
in the variegated group.
6.22 When there is variegation on the green-yellow tobacco leaf, it shall still be graded
according to quality in the green-yellow tobacco group.
6.23 The calculation of damage is based on the percentage of the total area of damage
in a bundle of tobacco to the total area of the of tobacco leaves in that bundle; the
integrity of each leaf must be more than 50%; and less than 50% is listed as an out-of-
grade tobacco. See Table 4 for the provisions of the damage rate.
6.24 The requirements for purity tolerance are shown in Table 4.
7.2.1 Sampling for moisture inspection
The sampling quantity is no less than 0.5kg; it is taken on average from all samples
opened on site. If there are more than 10 samples opened during the on-site inspection,
select any one piece among every 2~3 pieces in the excessive part. Sampling
positions of each sample are drawn at an equal distance from 2 ~ 5 positions on a
diagonal line on the side of the opening; one bundle for each position; arbitrarily take
half bundle from each, and place in an airtight container. When testing, select 2 ~ 3
slices of compete leaves from each half bundle.
7.2.2 Sensory test methods
The first cured tobacco is based on the fact that the tendons are slightly soft and not
easy to break, and there is some sound when held by hand, and not easy to break.
7.2.3 Oven inspection method
7.2.3.1 Instruments and utensils
Analytical balance: sensitivity is 1/1000g.
Electric oven (or other oven): It has a temperature adjustment device, and can
automatically control the temperature in the range of ± 2°C; equipped with a 0 ~ 200°C
thermometer; mercury silver ball is located at 1.5~2.0cm above the sample shelf. Only
use the middle shelf.
Glass dryer: equipped with desiccant.
Sample box: made of aluminum, diameter 60 mm, height 25 mm, and marked with
numbers on the lid and the side wall of the bottom box.
7.2.3.2 Operating procedures
Approximately 1/4 of the leaves are uniformly extracted from the sample to be
inspected; and quickly cut into small pieces or strips with a width not exceeding 5 mm.
After mixing, take about 5~10g of the sample by a sample box with known dry weight;
and write down the weight of the sample. After removing the cover, put it in an oven at
a temperature of 100 ± 2°C. Since the temperature rises to 100 °C, bake for 2h; cover
it; take it out; put it in a desiccator; cool to room temperature; and then weigh it.
Calculate the percentage according to Formula (1):
Moisture (%) = × 100% …………………. (1)
NOTE: The determination of each batch of samples shall take parallel test; the difference
between the absolute value of the two shall not exceed 0.5%; and the average value of
the results of the parallel test shall be taken as the inspection result. If the error of the
inspection result.
The figures taken in the inspection results are subject to 0.1%; and the next digit is
rounded off according to GB 8170.
7.4 Flameout tobacco inspection
7.4.1 Sampling of flameout tobacco inspection
The sampling quantity is 5 positions for each piece; arbitrarily take two bundles for
each piece; arbitrarily take 1 leave for each bundle. Take sample on average from all
samples opened on site. Tobacco leaves that are not finished in piece; evenly take 10
bundles for each 50 kg; take 1 leave for each bundle; totally 10 leaves. For those less
than 50kg, still take 10 bundles, 1 leave for each bundle.
7.4.2 Combustion method is used for flameout tobacco inspection. Each leave is
transverse at its 1/3 cutters (that is, 1/3 of the leave tip and the 1/3 leave base are
removed); and then cut into three blocks in the horizontal direction. After being ignited
on an open flame, the flame is extinguished, meanwhile the time is counted to the last
fire point; it is called afterglow time. Two of the three blocks with afterglow time less
than 2s are the flameout leaves. After detection by this method, the flameout rate of
tobacco leaves is calculated according to Formula (3):
Flameout rate (%) = × 100% …………………. (3)
8 Inspection Rules
8.1 Grading, delivery, acquisition, and supply handover are all carried out in
accordance with this Standard.
8.2 On-site inspection
8.2.1 The sampling quantity: each batch (referring to the same area, the same grade
of flue-cured tobacco) is within 100 pieces, take 10% ~ 20% samples; if each batch is
more than 100 pieces, take 5% ~ 10% samples. If necessary, increase the sampling
ratio as appropriate.
8.2.2 Sampling of the finished pieces: sampling 5 ~ 7 positions from the center of each
piece to its surroundings, about 3 ~ 5 kg.
8.2.3 Sampling of unfinished pieces: it may be inspected in full, or sampling 6 ~ 9
positions, about 3 ~ 5 kg, or 30 ~ 50 bundles according to the position.
8.2.4 The sampling samples shall be inspected in accordance with the provisions of
Clause 7 of this Standard.
10.1.4 Packaging type
There are two kinds of packaging: sack packaging and carton packaging.
10.1.4.1 Sack packaging
The net weight of each pack is 50kg; and the package volume is 400mm×600mm×
800mm.
10.1.4.2 Carton or wooden box packaging
The net weight of each box is 200kg; and the outer diameter is
1115mm×690mm×725mm.
10.2 Marking
10.2.1 Handwriting must be clear, and a marking card must be placed in the pack.
10.2.2 The contents marked in front of the pack (piece):
a. Place of origin (province, county);
b. Grade (capital and code);
c. Weight (gross weight, net weight);
d. Production year and month;
e. Name of supplier.
10.2.3 The pack (piece) shall be marked with the grade and its code around
10.3 Transportation
10.3.1 When transporting packs (pieces), there must be coverings on top, tightly
packed, securely covered, protected from sunlight and moisture.
10.3.2 Must not be transported with odor and toxic substances, and transport vehicles
with odor and pollution shall not be shipped.
10.3.3 Handling must be done with care, and no pack-throwing or pack-hooking.
10.4 Storage
10.4.1 Stack height
The grades 1~2 (excluding subgroup 2) first cured tobacco packaged in sacks is no
more than 5 packs high; grades 3~4 is no more than 6 packs high. the re-dried tobacco
is no more than 7 packs high. Cardboard packaging is not subject to this restriction.
QB/T 2635-1992 "Flue-Cured Tobacco"
Amendment No.1
This amendment was approved by the State Bureau of Quality and Technical
Supervision on June 01, 1998 with the document ZJJH [1998] No. 027; and would be
implemented since July 01, 1998.
I. Article 3.1.9 Waste is changed as follows:
Tobacco leaf tissue is damaged, losing the strength and firmness of the strips, and
basically has no use value (including disease spots, scorched tips and scorched edges
due to the maturity increase of tobacco leaf), expressed by a percentage (%).
II. The values of waste in quality provisions (Table 3) of 5.2 are changed as follows:
a. Leaf lemon group B1L, B2L, B3L, B4L; leaf orange group B1F, B2F, B3F, B4F;
leaf red group B1R, B2R, B3R; totally 11 grades. And smoking leaf group H1F,
H2F; totally 2 grades. The waste control ratio is increased by 10 percentage
points per grade.
b. Cutters lemon group C1L, C2L, C3L; cutters orange group C1F, C2F, C3F; totally
6 grades. And lugs lemon group X1L, X2L, X3L, X4L; lugs orange group X1F,
X2F, X3F, X4F; totally 8 grades. The waste control ratio shall be increased by 5
percentage points per grade.
c. The oil provisions in partial grades of greenish group are adjusted as follows:
(1) X2V oil is adjusted from “oily” to “less oily”;
(2) C3V oil is adjusted from “rich” to “oily”;
(3) B2V oil is adjusted from “rich” to “oily”;
(4) B3V oil is adjusted from “oily” to “less oily”.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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